Improve checks to support IAP

lib/data/models/account_model.dart

@@ -111,6 +111,8 @@ abstract class AccountEntity
   @BuiltValueField(wireName: 'payment_id')
   String get paymentId;
 
+  bool get canMakeIAP => !hasIapPlan && paymentId.isEmpty;
+
   bool get isUpdateAvailable {
     if (disableAutoUpdate) {
       return false;

lib/ui/app/edit_scaffold.dart

@@ -151,7 +151,8 @@ class EditScaffold extends StatelessWidget {
                               onTap: () async {
                                 if (bannerClick != null) {
                                   bannerClick();
-                                } else if (supportsInAppPurchase()) {
+                                } else if (supportsInAppPurchase() &&
+                                    account.canMakeIAP) {
                                   showDialog<void>(
                                     context: context,
                                     builder: (context) => UpgradeDialog(),

lib/ui/app/invoice/invoice_email_view.dart

@@ -340,7 +340,8 @@ class _InvoiceEmailViewState extends State<InvoiceEmailView>
                         ),
                       ),
                       onPressed: () {
-                        if (supportsInAppPurchase()) {
+                        if (supportsInAppPurchase() &&
+                            state.account.canMakeIAP) {
                           showDialog<void>(
                             context: context,
                             builder: (context) => UpgradeDialog(),

lib/ui/reports/reports_screen.dart

@@ -432,7 +432,8 @@ class ReportsScreen extends StatelessWidget {
                     AppButton(
                         label: localization.upgrade.toUpperCase(),
                         onPressed: () {
-                          if (supportsInAppPurchase()) {
+                          if (supportsInAppPurchase() &&
+                              state.account.canMakeIAP) {
                             showDialog<void>(
                               context: context,
                               builder: (context) => UpgradeDialog(),

lib/ui/settings/account_management.dart

@@ -389,9 +389,7 @@ class _AccountOverview extends StatelessWidget {
                     ),
                   ),
                   onPressed: () {
-                    if (supportsInAppPurchase() &&
+                    if (supportsInAppPurchase() && account.canMakeIAP) {
-                        !account.hasIapPlan &&
-                        account.paymentId.isEmpty) {
                       showDialog<void>(
                         context: context,
                         builder: (context) => UpgradeDialog(),